<template>
    <div class="appContainer">
        <!-- 顶部区域额 -->
        <mt-header fixed title="黑马程序员 后端作业">
            <span slot="left" @click="goback" v-show="flag">
                <mt-button icon="back">返回</mt-button>
            </span>
        </mt-header>


        <!-- 中间路由区域 -->
        <transition><router-view></router-view></transition>


        <!-- 底部区域 -->
        <nav class="mui-bar mui-bar-tab">
            <router-link class="mui-tab-item-cs" to="/home">
                <span class="mui-icon mui-icon-home"></span>
                <span class="mui-tab-label">首页</span>
            </router-link>
            <router-link class="mui-tab-item-cs" to="/member">
                <span class="mui-icon mui-icon-contact"></span>
                <span class="mui-tab-label">会员</span>
            </router-link>
            <router-link class="mui-tab-item-cs" to="/shop">
                <span class="mui-icon mui-icon-extra mui-icon-extra-cart"><span class="mui-badge" id="shopBallPositon">{{ $store.getters.sumCount}}</span></span>
                <span class="mui-tab-label">购物车</span>
            </router-link>
            <router-link class="mui-tab-item-cs" to="/search">
                <span class="mui-icon mui-icon-gear"></span>
                <span class="mui-tab-label">搜索</span>
            </router-link>
        </nav>
    </div>
</template>
<script>
export default{
    data(){
        return{
            flag:false,
        }
    },
    created(){
        // 在刚进入页面时，路由地址没有改变，所以必须判断一下
        this.flag=this.$route.path==="/home"? false : true;
    },
    methods:{
        goback(){
            this.$router.go(-1);
        }
    },
    watch:{
        "$route.path":function(nVal,oVal){

            if(nVal==="/home"){
                this.flag=false;
            }else{
                this.flag=true;
            }
        }
    }
}
</script>

<style lang="less" scoped>
.appContainer{
    overflow:hidden;
}
.mui-bar{
    webkit-box-shadow: 0 0 0px rgba(0,0,0,.85);
    box-shadow: 0 0 0px rgba(0,0,0,.85);
}
.v-enter{
    opacity:0;
    transform:translateX(100%);
}
.v-leave-to{
    position:absolute;
    opacity:0;
    left:-300%;
}
.v-enter-active,
.v-leave-active{
    transition:all 0.6s ease;
}
// 这里的mui-tab-item类名和滑动条冲突了，为了解决，拷贝所有mui-tab-item及其相关的样
// 式，改名为mui-tab-item-cs，即可解决问题
.mui-bar-tab .mui-tab-item-cs.mui-active {
    color: #007aff;
}
.mui-bar-tab .mui-tab-item-cs {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
}
.mui-bar-tab .mui-tab-item-cs .mui-icon {
    top: 3px;
    width: 24px;
    height: 24px;
    padding-top: 0;
    padding-bottom: 0;
}
.mui-bar-tab .mui-tab-item-cs .mui-icon~.mui-tab-label {
    font-size: 11px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
}



</style>